在喜马拉雅山脚的土地利用梯度上有机物来源和分布 河流:从分子标记器的洞察力
Diptimayee Behera1, Dharia Chetan1, Ambili Anoop1
1Indian Institute of Science Education and Research Mohali, Sector 82, Mohali, Punjab-140306, India.
Environmental research
|April 14, 2024
概括
在喜马拉雅河流沉积物中的碳化合物生物标记分析揭示了石油产品和废物造成的大量人为污染. 了解这些有机物质来源对于制定有效的缓解策略和保护水生态系统至关重要.
科学领域:
- 环境化学环境化学
- 地质化学 地质化学
- 有机地化学 有机地化学
背景情况:
- 河流系统对于有机物 (OM) 的运输至关重要,并且日益受到人类活动的影响.
- 了解沉积物中OM的来源和成分对于评估环境健康和污染水平至关重要.
- 印度喜马拉雅山脉的马尔坎达河为研究自然过程和人类活动影响的地区的OM动态提供了一个案例研究.
研究的目的:
- 分析马坎达河表面沉积物中的碳化合物生物标志物.
- 要区分有机物 (OM) 的自然和人为来源.
- 确定碳化合物污染的具体来源及其分布.
主要方法:
- 碳化合物生物标志物的分析,包括n-基,霍,基,多环芳 (PAH),线性基 (LAB) 和酸盐.
- 计算各种指数 (例如,OEP,ACL,TAR,CPI,NAR) 以区分有机物质来源.
- 通过未溶解复杂混合物 (UCM) 和特定生物标志物识别石油污染.
- 使用正矩阵因子化 (PMF) 的PAH和甲酸盐的来源分配.
主要成果:
- 检测到显著的人为污染,PAHs (24.6 ng/g dw),LABs (18.1 ng/g dw) 和酸盐 (8.3 μg/g dw) 的平均度.
- 观察到污染物度的空间异质性,与土地使用模式有关.
- 石油产品,工业排放,文化实践和污水处理被确定为人为碳化合物的主要来源.
- 生物标志物分析成功地将自然的OM与污染产生的输入区分开来.
结论:
- 人类活动对马尔坎达河沉积物中的有机物成分产生重大影响.
- 土地使用模式在调节OM来源方面发挥着关键作用.
- 该研究为制定有针对性的减缓战略提供了必要的数据,以减少河流生态系统中的碳化合物污染.
- 这些发现有助于对人类对水生环境的影响的全球理解.
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